package 剑指offer_力扣版.Month07.day03数组;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class 数组中和为0的三个数 {
    public List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> lists = new ArrayList<>();
        Arrays.sort(nums);
        for (int i = 0; i < nums.length; i++) {
            if(nums[i] > 0) break;
            if(i > 0 && nums[i] == nums[i - 1]) continue;
            int left = i + 1;
            int right = nums.length - 1;
            while(left < right){
                int res = nums[left] + nums[right] + nums[i];
                if(res > 0){
                    right--;
                }else if(res < 0){
                    left++;
                }else{
                    lists.add(Arrays.asList(nums[i],nums[left],nums[right]));
                    while(left < right && nums[left] == nums[left + 1]){
                        left++;
                    }
                    while(left < right && nums[right] == nums[right - 1]){
                        right--;
                    }
                    left++;
                    right--;
                }
            }
        }
        return lists;
    }
}
